Hey guys, I am looking into upgrading my son's '04 CRF50 to try and compete with the KTM 50s in the PW4-6 classes. I know that it might be easier to just buy him a new KTM Senior but I don't want to spend 3K on a bike that I have to fiddle with all the time (i.e., clutches, new parts, etc.). The CRF is lagging behind the KTMs in 3 main areas: power, suspension, and weight. I figure since the big 4s get to run twice the CCs then, I should be able to run at least a 100 cc 4 (maybe a 110) against the 2 stroke 50s. My question is would an 88 big bore kit or a 110 kit make as much HP as the KTM 50s? If so, are there any shocks and forks that can be adjusted for a kid weighing 60-70lbs? Lastly, are the aftermarket frames and swingarms significantly lighter than the stock components? I was thinking that I could also throw a 3-speed manual transmission on it too. I just think that it would be really cool to have a little thumper out there on the track banging bars with the 2-strokers. What do you guys think?